Count the number of Sick Days (Denoted by "S") for each employee

so I have created a leaver tracker for our employees in an excel file. Background: Each sheet represents each month (ie: Jan, Feb, Mar, etc.) which includes the following information:

** Note: This file is a template I downloaded from Google.

I have created another sheet which outlines the following: Note: these are sample data.

Question: What formula can I use to count the number of Sick Days (S), Annual Leavel (H) and Half Days (HA) separately for all 12 months across all sheets with 1 formula?